/********************************************************************* * Copyright 2018, University Corporation for Atmospheric Research * See netcdf/README file for copying and redistribution conditions. * $Header: /upc/share/CVS/netcdf-3/nctest/nctime.c,v 1.12 1996/04/30 17:56:58 davis Exp $ *********************************************************************/ /* * This is a standalone benchmark program for timing netCDF hyperslab accesses. * Once it is built, the benchmarks are run by invoking it with the shape of a * four-dimensional netCDF variable, e.g. * * nctime 10 20 30 40 * * which will run timing benchmarks accessing 1-, 2-, 3-, and 4-dimensional * slabs from 10 by 20 by 30 by 40 variables of each type. The first dimension * varies most slowly and is an unlimited (record) dimension. * * This program is especially useful for testing the effect of various compiler * optimization levels or platform-specific optimizations on the performance of * netCDF I/O. */ #include #include #include #include #include /* for HZ */ #include #include #include #ifndef HZ #ifdef CLK_TCK #define HZ CLK_TCK #else #define HZ 60 #endif #endif #include "netcdf.h" struct ncdim { /* dimension */ char *name; long size; }; struct ncvar { /* variable */ char *name; nc_type type; int ndims; int *dims; int natts; }; #define LEN_OF(array) ((sizeof array) / (sizeof array[0])) /* Number of dimensions. Changing this requires other changes as well. */ #define NDIMS 4 #define NVARS 6 /* number of variables, one for each type */ /* Any function that maps dimension values 1-1 to values is OK here */ #define VF(w) 1000*w[0]+100*w[1]+10*w[2]+w[3] static int DEFAULTDIMS[NDIMS] = {10, 20, 30, 40}; /* * Fill typed array element with specified value, that is * * v[ii] = val; */ static void val_stuff(type, v, ii, val) /* v[ii] = val */ nc_type type; /* netcdf type of v, NC_BYTE, ..., NC_DOUBLE */ void *v; /* array of specified type */ int ii; /* it's v[ii] we want to store into */ long val; /* value to store */ { union gp { char cp[1]; short sp[1]; nclong lp[1]; float fp[1]; double dp[1]; } *gp; gp = (union gp *) v; switch (type) { case NC_BYTE: case NC_CHAR: gp->cp[ii] = (char) val; break; case NC_SHORT: gp->sp[ii] = (short) val; break; case NC_LONG: gp->lp[ii] = (nclong) val; break; case NC_FLOAT: gp->fp[ii] = (float) val; break; case NC_DOUBLE: gp->dp[ii] = (double) val; break; } } /* * Compare typed array element with specified value, that is return * * (v[ii] != val) * * returns 0 if equal, 1 if not equal */ static int val_diff(type, v, ii, val) /* v[ii] != val */ nc_type type; /* netcdf type of v, NC_BYTE, ..., NC_DOUBLE */ void *v; /* array of specified type */ int ii; /* it's v[ii] we want to compare */ long val; /* value to compare with */ { union gp { char cp[1]; short sp[1]; nclong lp[1]; float fp[1]; double dp[1]; } *gp; gp = (union gp *) v; switch (type) { case NC_BYTE: case NC_CHAR: return (gp->cp[ii] != (char) val); case NC_SHORT: return (gp->sp[ii] != (short) val); case NC_LONG: return (gp->lp[ii] != (nclong) val); case NC_FLOAT: return (gp->fp[ii] != (float) val); case NC_DOUBLE: return (gp->dp[ii] != (double) val); } /* NOTREACHED */ return 0; } /* * The following timing macros can be used by including the necessary * declarations with * * TIMING_DECLS ; * * and surrounding sections of code to be timed with the "statements" * * TIMING_START ; * [code to be timed goes here] * TIMING_END ; * * (The terminating semicolon is required for TIMING_DECLS and TIMING_END.) * The macros assume the user has stored a description of what is being timed * in the user-declared string time_mess, and has included */ #define TIMING_DECLS \ long TMreps; /* counts repetitions of timed code */ \ long TMrepeats; /* repetitions needed to exceed a second */ \ clock_t TMus, TMsy; /* user and system time in clock ticks */ \ float TMelapsed; /* elapsed time in seconds */ \ struct tms TMru; #define TIMING_START \ TMrepeats = 1; \ do { /* loop enough times for at least 0.1 second elapsed time */ \ TMrepeats *= 2; \ times(&TMru); \ TMus = TMru.tms_utime; \ TMsy = TMru.tms_stime; \ for(TMreps=0;TMreps < TMrepeats;TMreps++) { #define TIMING_END \ } \ times(&TMru); \ TMus = TMru.tms_utime - TMus; \ TMsy = TMru.tms_stime - TMsy; \ TMelapsed= (float) (TMus+TMsy) / (float) HZ; \ if (TMreps < TMrepeats) break; \ } while (TMelapsed < 0.1 ); \ printf("time for %-20.20s %10.3f msec\n", \ time_mess, TMelapsed*1000./(TMreps+1)) /* * For each type of variable, put a four-dimensional hypercube of values * with a single call to ncvarput. Then use ncvarget to retrieve a single * value, a vector of values along each of the four dimensions, a plane of * values along each of the six pairs of dimensions, a cube of values along * each of the four triples of dimensions, and all the values. */ void test_slabs(ncid, sizes) int ncid; /* handle of netcdf open and in data mode */ int *sizes; /* dimension sizes */ { char time_mess[100]; struct ncdim dims[NDIMS]; int dimids[NDIMS]; /* dimension ids */ long corner[NDIMS], edge[NDIMS], point[NDIMS]; static struct ncvar va[NVARS] = { /* variables of all types */ {"byte_var", NC_BYTE, NDIMS, 0, 0}, {"char_var", NC_CHAR, NDIMS, 0, 0}, {"short_var", NC_SHORT, NDIMS, 0, 0}, {"long_var", NC_LONG, NDIMS, 0, 0}, {"float_var", NC_FLOAT, NDIMS, 0, 0}, {"double_var", NC_DOUBLE, NDIMS, 0, 0}, }; void *v; int varid[NVARS], iv; /* variable id */ int idim, jdim, kdim, ldim; int iw, ix, iy, iz, ii, jj, kk; static char* dnames[] = {"w", "x", "y", "z", "u", "v", "a", "b", "c", "d"}; assert(NDIMS <= LEN_OF(dnames)); for (idim = 0; idim < NDIMS; idim++) { dims[idim].size = sizes[idim]; dims[idim].name = dnames[idim]; } /* back in define mode OK, now add dimensions */ dimids[0] = ncdimdef(ncid, dims[0].name, NC_UNLIMITED); if (dimids[0] == -1) { ncclose(ncid); return; } for (idim = 1; idim < NDIMS; idim++) { dimids[idim] = ncdimdef(ncid, dims[idim].name, dims[idim].size); if (dimids[idim] == -1) { ncclose(ncid); return; } } /* define a multi-dimensional variable of each type */ for (iv = 0; iv < NVARS; iv++) { va[iv].dims = (int *) malloc(sizeof(int) * (unsigned)va[iv].ndims); for (idim = 0; idim < va[iv].ndims; idim++) va[iv].dims[idim] = dimids[idim]; varid[iv] = ncvardef(ncid, va[iv].name, va[iv].type, va[iv].ndims, va[iv].dims); if (varid[iv] == -1) { ncclose(ncid); return; } } if (ncendef (ncid) == -1) { ncclose(ncid); return; } printf("Note: first ncvarput writes fill values for all variables.\n"); for (iv = 0; iv < NVARS; iv++) { /* test each type of variable */ TIMING_DECLS ; printf("\n----- %s(%d,%d,%d,%d)\n", va[iv].name, sizes[0], sizes[1], sizes[2], sizes[3]); v = (void *) malloc((unsigned)sizes[0]*sizes[1]*sizes[2]*sizes[3] * nctypelen(va[iv].type)); /* fill it with values using a function of dimension indices */ ii = 0; for (iw=0; iw < sizes[0]; iw++) { corner[0] = iw; for (ix=0; ix < sizes[1]; ix++) { corner[1] = ix; for (iy=0; iy < sizes[2]; iy++) { corner[2] = iy; for (iz=0; iz < sizes[3]; iz++) { corner[3] = iz; /* v[ii++] = VF(corner); */ val_stuff(va[iv].type, v, ii, VF(corner)); ii++; } } } } for (idim = 0; idim < NDIMS; idim++) { corner[idim] = 0; edge[idim] = dims[idim].size; } snprintf(time_mess, sizeof(time_mess),"ncvarput %ldx%ldx%ldx%ld", edge[0], edge[1], edge[2], edge[3]); TIMING_START ; /* ncvarput the whole variable */ if (ncvarput(ncid, varid[iv], corner, edge, (void *) v) == -1) { ncclose(ncid); return; } TIMING_END ; /* * For several combinations of fixed dimensions, get a slab and compare * values to function values. */ /* get an interior point */ for (idim=0; idim < NDIMS; idim++) { corner[idim] = dims[idim].size/2; edge[idim] = 1; point[idim] = corner[idim]; } snprintf(time_mess, sizeof(time_mess),"ncvarget %ldx%ldx%ldx%ld" ,edge[0],edge[1],edge[2],edge[3]); TIMING_START ; if (ncvarget(ncid, varid[iv], corner, edge, (void *) v) == -1) return; TIMING_END ; /* if (v[0] != VF(point)) */ if (val_diff(va[iv].type, v, 0, VF(point))) fprintf(stderr,"ncvarget got wrong value for point"); /* get a vector in each direction */ for (idim=0; idim < NDIMS; idim++) { for (jdim=0; jdim < NDIMS; jdim++) { corner[jdim] = 0; edge[jdim] = 1; point[jdim] = corner[jdim]; } corner[idim] = 0; /* get vector along dimension idim */ edge[idim] = dims[idim].size; snprintf(time_mess, sizeof(time_mess),"ncvarget %ldx%ldx%ldx%ld" ,edge[0],edge[1],edge[2],edge[3]); TIMING_START ; if (ncvarget(ncid, varid[iv], corner, edge, (void *) v) == -1) return; TIMING_END ; for (ii=corner[idim]; ii < edge[idim]; ii++) { point[idim] = ii; /* if (v[ii] != VF(point)) */ if (val_diff(va[iv].type, v, ii, VF(point))) fprintf(stderr,"ncvarget got wrong value for vector"); } } /* get a plane in each direction */ for (idim=0; idim < NDIMS; idim++) { for (jdim=idim+1; jdim < NDIMS; jdim++) { for (kdim=0; kdim < NDIMS; kdim++) { /* reset corners and edges */ corner[kdim] = 0; edge[kdim] = 1; point[kdim] = corner[kdim]; } corner[idim] = 0; /* plane along dimensions idim jdim */ corner[jdim] = 0; edge[idim] = dims[idim].size; edge[jdim] = dims[jdim].size; snprintf(time_mess, sizeof(time_mess),"ncvarget %ldx%ldx%ldx%ld" ,edge[0],edge[1],edge[2],edge[3]); TIMING_START ; if (ncvarget(ncid, varid[iv], corner, edge, (void *) v) == -1) return; TIMING_END ; for (ii=corner[idim]; ii < edge[idim]; ii++) { for (jj=corner[jdim]; jj < edge[jdim]; jj++) { point[idim] = ii; point[jdim] = jj; /* if (v[(ii)*edge[jdim]+jj] != VF(point)) { */ if (val_diff(va[iv].type, v, (ii)*(int)edge[jdim]+jj, VF(point))) { fprintf(stderr, "ncvarget got wrong value in plane"); } } } } } /* get a cube in each direction */ for (idim=0; idim < NDIMS; idim++) { for (jdim=idim+1; jdim < NDIMS; jdim++) { for (kdim=jdim+1; kdim < NDIMS; kdim++) { for (ldim=0; ldim < NDIMS; ldim++) { /* reset corners, edges */ corner[ldim] = 0; edge[ldim] = 1; point[ldim] = corner[ldim]; } corner[idim] = 0; /* intr. cube along idim jdim kdim */ corner[jdim] = 0; corner[kdim] = 0; edge[idim] = dims[idim].size; edge[jdim] = dims[jdim].size; edge[kdim] = dims[kdim].size; snprintf(time_mess, sizeof(time_mess),"ncvarget %ldx%ldx%ldx%ld" ,edge[0],edge[1],edge[2],edge[3]); TIMING_START ; if (ncvarget(ncid, varid[iv], corner, edge, (void *) v) == -1) return; TIMING_END ; for (ii=corner[idim]; ii < edge[idim]; ii++) { for (jj=corner[jdim]; jj < edge[jdim]; jj++) { for (kk=corner[kdim]; kk < edge[kdim]; kk++) { point[idim] = ii; point[jdim] = jj; point[kdim] = kk; /* if (v[((ii)*edge[jdim]+jj)* edge[kdim]+kk] != VF(point)) { */ if (val_diff(va[iv].type,v, ((ii)*(int)edge[jdim]+jj)* (int)edge[kdim]+kk,VF(point))) { fprintf(stderr, "ncvarget - bad value in cube"); } } } } } } } /* get one 4-D slab of data */ for(idim = 0; idim < NDIMS; idim++) { corner[idim] = 0; edge[idim] = dims[idim].size; } snprintf(time_mess, sizeof(time_mess),"ncvarget %ldx%ldx%ldx%ld" ,edge[0],edge[1],edge[2],edge[3]); TIMING_START ; if (ncvarget(ncid, varid[iv], corner, edge, (void *) v) == -1) return; TIMING_END ; free(v); } } void usage(argv) char **argv; { int i; fprintf(stderr, "usage: %s ", argv[0]); for (i=0; i < NDIMS; i++) fprintf(stderr, "dim%d ", i); fprintf(stderr, "\n"); } int main(argc, argv) int argc; char **argv; { int ncid; int i; int w[NDIMS]; if (argc != NDIMS+1) { for (i = 0; i < NDIMS; i++) w[i] = DEFAULTDIMS[i]; } else { for (i = 0; i < NDIMS; i++) w[i] = atoi(argv[i+1]); } ncid = nccreate("benchmark.nc",NC_CLOBBER); test_slabs(ncid, w); ncclose(ncid); return 0; }